你有很多的選擇,因爲你提到使用)的LD_PRELOAD包裝寫(讀/()函數是一個不錯的辦法。
我建議你使用UNIX的ptrace(2)抓住了所需的系統調用和傳遞參數給自己的函數。
例子:
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <linux/user.h>
#include <sys/syscall.h> /* For SYS_write etc */
int main()
{ pid_t child;
long orig_eax, eax;
long params[3];
int status;
int insyscall = 0;
child = fork();
if(child == 0) {
ptrace(PTRACE_TRACEME, 0, NULL, NULL);
execl("/bin/ls", "ls", NULL);
}
else {
while(1) {
wait(&status);
if(WIFEXITED(status))
break;
orig_eax = ptrace(PTRACE_PEEKUSER,
child, 4 * ORIG_EAX, NULL);
if(orig_eax == SYS_write) {
if(insyscall == 0) {
/* Syscall entry */
insyscall = 1;
params[0] = ptrace(PTRACE_PEEKUSER,
child, 4 * EBX,
NULL);
params[1] = ptrace(PTRACE_PEEKUSER,
child, 4 * ECX,
NULL);
params[2] = ptrace(PTRACE_PEEKUSER,
child, 4 * EDX,
NULL);
printf("Write called with "
"%ld, %ld, %ld\n",
params[0], params[1],
params[2]);
}
else { /* Syscall exit */
eax = ptrace(PTRACE_PEEKUSER,
child, 4 * EAX, NULL);
printf("Write returned "
"with %ld\n", eax);
insyscall = 0;
}
}
ptrace(PTRACE_SYSCALL,
child, NULL, NULL);
}
}
return 0;
}
謝謝您的回答。我也必須抓住fork(),但這應該是可行的。然而,這是否足夠表現明智,例如。如果我在系統上追蹤很多進程?這個解決方案會影響追蹤的程序嗎? – jpalecek 2009-01-20 17:30:13